package com.gzh.system.config;


import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.Resource;

@Configuration
public class DirectRabbitConfig implements BeanPostProcessor {
    @Resource
    private RabbitAdmin rabbitAdmin;
    @Bean
    public Queue rabbitmqDemoDirectQueue(){
        /**
         * 1、name:    队列名称
         * 2、durable: 是否持久化
         * 3、exclusive: 是否独享、排外的。如果设置为true，定义为排他队列。则只有创建者可以使用此队列。也就是private私有的。
         * 4、autoDelete: 是否自动删除。也就是临时队列。当最后一个消费者断开连接后，会自动删除。
         * */
        return new Queue(RabbitMQConfig.RABBITMQ_TOPIC,true,false,false);
    }

    @Bean
    public DirectExchange rabbitmqDemoDirectExchange(){
        //Direct交换机
        return new DirectExchange(RabbitMQConfig.RABBITMQ_DIRECT_EXCHANGE,true,false);
    }

    @Bean
    public Binding bindDirect(){
        //链式写法，绑定交换机和队列，并设置匹配键
        return BindingBuilder
                //绑定队列
                .bind(rabbitmqDemoDirectQueue())
                //绑定交换机
                .to(rabbitmqDemoDirectExchange())
                //配置匹配键
                .with(RabbitMQConfig.RABBITMQ_DIRECT_ROUTING);
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        // 只有设置为 true，spring 才会加载 RabbitAdmin 这个类
        rabbitAdmin.setAutoStartup(true);
        return rabbitAdmin;
    }

    //这样启动生产者就会自动创建交换机和队列，不用等到发送消息才创建。
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        rabbitAdmin.declareExchange(rabbitmqDemoDirectExchange());
        rabbitAdmin.declareQueue(rabbitmqDemoDirectQueue());
        return null;
    }
}
